Nonaggressive is a word that describes someone or something that is not violent or hostile. Some synonyms that could be used to describe nonaggressive behavior or tendencies include peaceful, gentle, mild, calm, amiable, and docile. Other potential synonyms that could be used to describe nonaggressive actions or attitudes might include cooperative, passive, restrained, considerate, or diplomatic. Depending on the context, there could be a variety of different words that would accurately convey the meaning of nonaggressive behavior or demeanor. Ultimately, the selection of synonyms would depend on the specific situation and the nuance that the writer or speaker is trying to convey.